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Commit 2373c180 authored by Manuel Lauss's avatar Manuel Lauss Committed by Jean Delvare
Browse files

i2c-ocores: basic PM support 



Basic PM support: reinit the core on resume, disable it on suspend.

Signed-off-by: default avatarManuel Lauss <mano@roarinelk.homelinux.net>
Acked-by: default avatarPeter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 392a0408

drivers/i2c/busses/i2c-ocores.c

+35 −7
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ struct ocores_i2c { 
	int pos;

	int nmsgs;

	int state; /* see STATE_ */

	int clock_khz;

};



/* registers */
@@ -173,8 +174,7 @@ static int ocores_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) 
		return -ETIMEDOUT;

}



static void ocores_init(struct ocores_i2c *i2c,

			struct ocores_i2c_platform_data *pdata)

static void ocores_init(struct ocores_i2c *i2c)

{

	int prescale;

	u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL);
@@ -182,7 +182,7 @@ static void ocores_init(struct ocores_i2c *i2c, 
	/* make sure the device is disabled */

	oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN));



	prescale = (pdata->clock_khz / (5*100)) - 1;

	prescale = (i2c->clock_khz / (5*100)) - 1;

	oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff);

	oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8);
@@ -248,7 +248,8 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev) 
	}



	i2c->regstep = pdata->regstep;

	ocores_init(i2c, pdata);

	i2c->clock_khz = pdata->clock_khz;

	ocores_init(i2c);



	init_waitqueue_head(&i2c->wait);

	ret = request_irq(res2->start, ocores_isr, 0, pdev->name, i2c);
@@ -312,12 +313,39 @@ static int __devexit ocores_i2c_remove(struct platform_device* pdev) 
	return 0;

}



#ifdef CONFIG_PM

static int ocores_i2c_suspend(struct platform_device *pdev, pm_message_t state)

{

	struct ocores_i2c *i2c = platform_get_drvdata(pdev);

	u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL);



	/* make sure the device is disabled */

	oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN));



	return 0;

}



static int ocores_i2c_resume(struct platform_device *pdev)

{

	struct ocores_i2c *i2c = platform_get_drvdata(pdev);



	ocores_init(i2c);



	return 0;

}

#else

#define ocores_i2c_suspend	NULL

#define ocores_i2c_resume	NULL

#endif



/* work with hotplug and coldplug */

MODULE_ALIAS("platform:ocores-i2c");



static struct platform_driver ocores_i2c_driver = {

	.probe   = ocores_i2c_probe,

	.remove  = __devexit_p(ocores_i2c_remove),

	.suspend = ocores_i2c_suspend,

	.resume  = ocores_i2c_resume,

	.driver  = {

		.owner = THIS_MODULE,

		.name = "ocores-i2c",